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Stockholders' Equity - Summary of Vested and Unvested Options, Weighted Average Exercise Price per Share, Weighted Average Remaining Term and Aggregate Intrinsic Value (Detail) (USD $) | 12 Months Ended
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Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Number of Shares, Vested | 1,878,695
Number of Shares, Unvested | 455,631
Number of Shares, Total | 2,334,326
Weighted Average Exercise Price Per Share, Vested | $ 3.94
Weighted Average Exercise Price Per Share, Unvested | $ 4.80
Weighted Average Exercise Price Per Share, Total | $ 4.11
Weighted Average Remaining Contractual Life, Vested | 5 years
Weighted Average Remaining Contractual Life, Unvested | 7 years 3 months 29 days
Weighted Average Remaining Contractual Life, Total | 5 years 5 months 16 days
Aggregate Intrinsic Value, Vested | $ 1,090,096
Aggregate Intrinsic Value, Unvested | 8,084
Aggregate Intrinsic Value, Total | $ 1,098,180

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